Optical clock contributions to TAI Sample Clauses

Optical clock contributions to TAI. Incorporation of optical clocks into international timescales as secondary representations of the second is achieved through comparison of the optical clocks with clocks (hydrogen masers) that are used in the computation of TAI and submission of this frequency comparison data to the BIPM for inclusion in the monthly bulletin Circular T. With the current definition of the SI second based on the caesium hyperfine transition, optical clocks may only contribute to TAI with the uncertainty of the recommended value for the secondary representation of the second. The work contributing to this objective therefore fell into two parts: the derivation of optimised frequency values for secondary representations of the second (section 4.4.1) and the collection and submission of optical clock data for use by the BIPM in computing TAI (section 4.4.2).
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